Origin of the name LEO.
Etymology of the
name LEO.
Meaning of the baby name LEO.

LEO (Λέω).
Latin and Greek name meaning "a lion." (The Standard Dictionary of
Facts, Ruoff, 1922). In use in very
early times by the Greeks. Also see Leon
and Leonard.

... Two popes, to whom Rome owed
the deepest debt of gratitude—to the one, for interceding with Attila;
to the other, for turning away the wrath of the Saracens—were both
called Leo, and it thus became a favourite on the papal throne, and was
considered to allude to the Lion of the Tribe of Judah, which was
therefore sculptured on St. Peter's in the time of the Medicean Leo X. (History
of Christian Names, Yonge, 1884)